Safety sheave block



May 29, 1928. 1,671,435

w; H. McKlsslcK SAFETY'SHEAVE BLOCK Filed April 1, 1927 2 Sheets-Sheet l ATTORNEY May 29, 192s. 1,611,435 W. H. MGKISSICK SAFETY SHEAVE BLOCK FileQ/April l. 1927 2 Sheets-Sheetl 2 Mld/Winsen? Patented May 29, 1928.

UNITED stares innen earsnr ortica.

WILLIAMH. McKissIoK, oFTULsA, OKLAHOMA. p

:SAFETY SHEAVE BLOCK.

Applicaties med apra' `1,

This invention relates to new andv useful improvements in safety sheave blocks.

The object of the invention is to provide a sheave block having line gaps in its guards normally closedv by a shiftable closure manner which latter' is arranged to be shifted to open said gaps, whereby the cable lines invention will be hereinafter described, to-v getl'ier with other features of the invention.

The invention will be more readily understood from a reading of the following specificationand by reference tothe accompanylng drawings in which an example of the invention is shown and wherein:

Fig. 1 is a perspective View of a sheave block constructed in accordance with my invention and having its line gaps closed,

Figz 2 is a transverse vertical sectional View of said block,

Fig. 3 is a perspective view 'ofthe shiftable closure member,

Fig. 4 is a sectional detail showing the closure member shifted to its open position,

Fig. 5 is a perspective view of another form of block constructed in accordance with the invention, .Y

Fig. 6 is a transverse verticaly sectional view of said block.

Fig. 7 is a perspective view of the shiftable closure member of said block, and p Fig. Sis a. sectional detail showing the closure member shifted to its openp'osition.

In the drawings'the numeral 10 designates an upper becketsupporting a becket bolt l1 in its lower ends.l The bolt penetrates the upper ends of vertical side bars 12 between which' the becket is pivoted. A bottom becket 13 has its ends journaled on a bolt 134 penetrating the lower ends of the v'side ars.

`At their central portions the bars support tir-'transverse axle l5 passing eoncentrieally 1927. 'serial No. leales.'

between side plates 16, suitably fastened'to theinner sides of said bars and positioned vertically between the becketsl While the side plates are shown `as circular, they may be given any suitable shape. On the axle apair ofsheaves or pulleys 1f are journaled` between and parallel to theplates. The sheaves yare separated by a vertical division'or partition plater 18 which may conform to the size and shape vof the side plates; `The plate 18 has a central aperture '19 whereby it is journaled on the axle 15. A finger 2Oextending` from the edge of the plate has an eye 21 for receiving the bottom becket bolt 14, whereby the partition plate is held againstrotation.,` y

On each side plate and on opposite sides Of the bars 12 I provide inwardly directed guard iianges 22 and 23, respectively. These .f

guard flanges are at substantially right angles to the side plates and extend transversely of the sheaves across the grooves 'or faces thereof. Each flange 22 has its inner edge inclinedfupwardl-y so as to overhang the contiguous downwardly inclined edge vof a closure wing24f mounted on the edge` of the` partition-18; while-each flange 23 has its inner edge inclineddownwardly so as to underlie the contiguous 'overhanging 'edge of a closure wing 25 mounted on the opposite edge of the partition. i i y The wings and flanges arev preferably flush and are curved to conform to the side plates and the partition. The partition 18 with its wings constitutesa shiftable closure mem-V ber. These fianges and wings being located on opposite sides .of the side bars extend vertically and terminateyshort lof the bottoms and tops of the side plates. The ,sidev plates. and flanges form a cylindrical enclosure.

By removing the bolt lathe partition is free to'be rotated in a counter-clockwise directiong'whereby the wings 24 and 25 arel carried .from between the flanges to :the position shown in Fig. 4. This leaves 4gaps between the flanges-22 and 23 through which or removed.

When the gapsl are closed and the parts f.

are in their normal position, the ianges and wings form guards'protecting the workmen and preventing their fingers being caught between the lines and the sheaves. Above the sheavesr arched guards 26 are fastened to the inner sides of the plates 16 so as to overhang the sheaves. These guards come close to the partition 18 and have cable notches 27 in their ends. lIt is necessary to mount the guards low enough to permit the wind to swing thereover, as is shown in Fig. 4.

In Figs. 5to 8 inclusive, I have shown another form designed for onesheave and similar' in all respects, except as to size and number of parts. This form Yeoinprises .an upper becket mounted on a bolt 31 suspending side bars 32 carrying a bottom bolt 33 on which a bottom becketlf lis journaled. An axle-35 is carried by the -barsand Va sheave 36 is journaled on the 'axle between side plates 37. I

One of the side plates has a flange 3S with its inner edge inclined downwardly on one side; while on its opposite sidel is a flange 39 with its inner edgeV inclined upwardly. The other side plateisvfree from flanges, but a shiftable member-'comprising a circular plate 4&0. wings 41 and .4-2fand a finger 4l-3 is jour naled on the axle 35,'between saidside plate and the sheave; `The wings 4:1 and 42 are inclined to conform to the flanges and the side plate opposite the plate vtfl'has a vguard secured thereto.

Various changes in the size and` shape of the different part-s, as well as modifications vand alterations,fniay be made within the scope ofthe appended claims.

lIVhat-I claini,`is: f 1. In afsafetv sheave block, a support, a

sheave carried rbythe support, an enclosure around ythe support and carried by the support, the enclosure having upright line gaps opposite the groove of the sheave on 4each side of said sheave, and arrotatable closure ineniber jo-urnaled in the "enclosure 'and having wings normally closing said gaps.'

2. In a safety sheave block, a support, a sheave carried by the'support, an enclosure around the supportl and carried by the support, the enclosure liaviug upright line gaps' ropposite the groove of the sheave on each side of saidslieave, a rotatable closure meinber yournaled in the enclosure and having wings normally closing said gaps, vand means lfor fastening said closure member against rota-tion. y Y v I 1 a safety sheave block, a support, a sheave carried by the support, an Venclosure around the supportand carriedby thefsupport, the enclosure having upright line gaps oppositev the groove of the` sheave oneach side of said sheave, a rotatable clos-ure meme ber journaled in the enclosure vandhaving wings normally closing said gaps, and a` guard vcarried by thev support overhanging the sheave and rlocated so that onezof the wings may pass thereover when the closure member is rotated.

4.-. In a safety sheave block, a support, a

sheave carried by the support, a cylindrical enclosure surrounding the sheave and carried by the support, said enclosure having opposite line gaps one of which flares upy wardly and the othervof which flares dOWnwar-dly, ,a .rotatable closure member ,jours naled in the enclosureand having oppositely flared wings conforming to the gaps, and

normally closing the saine, and an extension v on the closure member for -holding it against rotation and for rotating it. l vi, v

6. In a safety sheave block, a pair of side bars, beckets at the top and-bottom of said bars, yan axle carried by said bars, ya sheave journaled on, the axle between the lbars, side plates Carried by the bars on each side .of the, sheave, guard flanges extending inwardly vfrom the plates transversely ofthe sheave,

the flanges of 'one platejbeing -spacedfroin the flanges of the other plate to form ygaps there-between, and a lplatejournaledxon the axleand having wings fitting betweenthe flanges in said gaps.

7. In a safetysheave block, a pair of side bars, beckets at the top and bottom of said bars, an axle carried by said bars, a sheave journaled onthe axlebetween the bars, side plates carried by the bars on each sideof the sheave, guard flanges extending inward.- lyfrom the plates transversely of the sheave, the flanges of one plate being spaced from the flanges of the other plate to form gaps there-between, av plate journaledlon fthe axle and having wings fitting between the flanges in said gaps, a bolt on which kthe bottoni becket is mounted, and a finger extending from the wing pla-te and `engaging the bottoni becket bolt. y j l 8. In a safety sheave block, a pair of side bars, beokets at the top and bottom of said bars, an axlecarried by said bars, sheaves journaled on the axle between the bars, side plates carried Eby the bars on each-sideof the sheaves, guard flanges extending inwardly from theplates transversely of the sheaves, the flanges of one plate being spaced from the flanges of the other plate to vforin gaps t-hereebetween, and a plate journaled on the axle between the sheaves andhaving wings fitting between the flanges in said gaps.

9. In a safety sheave block, a support, an

Venclosure carried by the support and having line gaps on each side of said support, a sheave in the enclosure disposed diametreally between said line gaps, closure members normally closing said line gaps, and a common means for shifting said closure members, whereby botlrline gaps are' opened at the same time. v

l0. In a safetysheave block, a support, an

' enclosure carried by the support and having elongated line' gaps on each side of said sup- 10 gaps and mounted on va common pivot, and a oommon means for rotating said closure 15 members in unison to open said linev gaps.

In testimony whereof I affix my signature.

WILLIAM H. MGKISSICK. 

